<template>
<div>
  <div class="search">
    <input v-model="keyword" class="search-input" type="text" placeholder="输入城市名或拼音" />
  </div>
  <div class="search-content" ref="serach" v-show="keyword">
    <ul>
      <li class="search-item border-bottom" @click="handleCityClick(item.name)"
       v-for="item in list" :key="item.id">
        {{item.name}}
      </li>
      <li v-show="hasNoData" class="search-item border-bottom">没有找到匹配数据</li>
    </ul>
  </div>
</div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapMutations } from 'vuex'
export default {
  name: 'CitySearch',
  props: {
    cities: Object
  },
  data () {
    return {
      keyword: '', // 关键词
      list: [], // 搜索结果
      timer: null // 节流函数变量
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.serach)
  },
  methods: {
    // 切换城市点击事件
    handleCityClick (city) {
      // this.$store.commit('changeCity', city) 改为下面代码
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  // 计算属性
  computed: {
    hasNoData () {
      return !this.list.length
    }
  },
  watch: {
    keyword () {
      // 如果没有关键词，list设为空
      if (!this.keyword) {
        this.list = []
        return
      }
      // 节流函数
      if (this.timer) {
        clearTimeout(this.timer)
      }
      this.timer = setTimeout(() => {
        const result = []
        for (let i in this.cities) {
          this.cities[i].forEach((value) => {
            // 当每项中的拼音或者名出符合时，push到result数组
            if (value.spell.indexOf(this.keyword) > -1 ||
             value.name.indexOf(this.keyword) > -1) {
              result.push(value)
            }
          })
        }
        this.list = result
      }, 100)
    }
  }
}
</script>

<style lang="stylus" scoped>
@import '~styles/varibles.styl'
.search
  padding:0 .1rem
  height: .72rem
  background : $bgColor
  .search-input
    box-sizing:border-box
    padding:0 .1rem
    width:100%
    height:.62rem
    line-height:.62rem
    text-align:center
    border-radius:.06rem
    color: #666
.search-content
  z-index: 1
  overflow: hidden
  position:absolute
  top: 1.58rem
  left:0
  right:0
  bottom:0
  background:#eee
  .search-item
    padding-left: .2rem
    line-height: .62rem
    background: #fff
    color: #666
</style>
